Overtrue\Socialite\Providers\WeChatProvider::getTokenFields PHP Method

    protected function getTokenFields($code)
    {
        $base = ['appid' => $this->clientId, 'code' => $code, 'grant_type' => 'authorization_code'];
        if ($this->isOpenPlatform()) {
            return array_merge($base, ['component_appid' => $this->config->get('wechat.open_platform.app_id'), 'component_access_token' => $this->config->get('wechat.open_platform.access_token')]);
        }
        return array_merge($base, ['secret' => $this->clientSecret]);
    }